Researchers have created a network that they say demonstrates the real-world feasibility of a quantum internet that's physically impossible to hack, at least without detection. Working with quantum startup Qunnect and networking company Cisco, the team connected a trio of nodes across New York's existing fiber-optic cables with quantum signals in the form of photons (packets of light) where quantum states are used to carry information through entangled qubits. By distributing and swapping entanglement between the signals, the scientists effectively connected them into a small quantum network. This third node acts as an intermediate hub where the team could perform entanglement swapping and routing, turning two links into a small multi‑node quantum network that can distribute entanglement across different pairs on demand. This would act more like a true network rather than a single line.…